toollib: introduce validate_lvname_param

Function for parsing and validating of lvname parameter.

2 files changed, 40 insertions, 0 deletions

diff --git a/tools/toollib.c b/tools/toollib.c
index 69da41bab..dbaaee772 100644
--- a/tools/toollib.c
+++ b/tools/toollib.c
@@ -1260,6 +1260,43 @@ int get_and_validate_major_minor(const struct cmd_context *cmd,
 	return 1;
 }
 
+/*
+ * Validate lvname parameter
+ *
+ * If it contains vgname, it is extracted from lvname.
+ * If there is passed vgname, it is compared whether its the same name.
+ */
+int validate_lvname_param(struct cmd_context *cmd, const char **vg_name,
+			  const char **lv_name)
+{
+	const char *vgname;
+	const char *lvname;
+
+	if (!lv_name || !*lv_name)
+		return 1;  /* NULL lvname is ok */
+
+	/* If contains VG name, extract it. */
+	if (strchr(*lv_name, (int) '/')) {
+		if (!(vgname = _extract_vgname(cmd, *lv_name, &lvname)))
+			return_0;
+
+		if (!*vg_name)
+			*vg_name = vgname;
+		else if (strcmp(vgname, *vg_name)) {
+			log_error("Please use a single volume group name "
+				  "(\"%s\" or \"%s\")", vgname, *vg_name);
+			return 0;
+		}
+
+		*lv_name = lvname;
+	}
+
+	if (!apply_lvname_restrictions(*lv_name))
+		return_0;
+
+	return 1;
+}
+
 struct name_id_list {
 	struct dm_list list;
 	const char *name;
diff --git a/tools/toollib.h b/tools/toollib.h
index 152b15a2e..3f50db1cb 100644
--- a/tools/toollib.h
+++ b/tools/toollib.h
@@ -141,4 +141,7 @@ int get_and_validate_major_minor(const struct cmd_context *cmd,
 				 const struct format_type *fmt,
 				 int32_t *major, int32_t *minor);
 
+int validate_lvname_param(struct cmd_context *cmd, const char **vg_name,
+			  const char **lv_name);
+
 #endif